Electromagnetically controlled reversing gear



May 24, 1932.

R. BERNADY 1,859,493

ELECTROMAGNETICALLY CONTROLLED REVERSING GEAR Filed Jan. 3, 1929 3 Sheets-Sheet l May 24, 1932. R. BERNADY 1,859,493

ELECTROMAGNETICALLY CONTROLLED REVERSING GEAR Filed Jan. 3, 1929 3 Sheets-Sheet 2 a /f'i 2 lI as I 1 Patented May 24, 1932 unirse STATES PATENT, orifice RAOUL BERNADY, OF NEUILLY, FRANCE, ASSGNOR TO SOCIETE DETUDES ET DE CONSTRUCTION 11i-APPAREILS DE TELEMECANIQUE, OF NEUILLY, FRANCE,V A (lO-Rf s PORATION 0F FRANCE nLncrnoMAeNnrrcALLY fcon'rnonnnn REVERSING GEAR i Application filed January 3, 1929, Serial No. 330,016, and in France January 14, 1928.

My invention has for its object a transmission adapted to be thrown into gear electromagnetically and to provide the 'transmission of orders, through the continuous 0r intermittent rotation in lthe desired direction of a suitable part such as a pulley operatively connected with the parts to be controlled. l v

My improved transmission comprises chiefly two toothed wheels rotating in op-v posite direction at the same speed and'two friction wheels adapted to control `the pulley or like part, an electromagnetic device such as an electromagnet with a plunger core being adapted to bring each friction wheel against the corresponding toothed wheel so as to be rotated therewith. l

Such electromagnetic clutches show" the advantage of allowingA instantaneous disconnections; on the vother hand, such clutches allow several transmissions to be controlled by a single motor, which is not the case with the usual relays adapted to change the 'direc-L tion of rotation. y

Another object of my invention is to provide a reducing gear comprising preferably several worms disposed between theabove described clutches and the pulley or like part so as to reduce the inertia drive, after the electromagnetic current is broken, to zero.` I obtain thus a great accuracy in the angles of rotation and I need not Vuse the braking systems which are required when a single worm is used. l

I also provide a contacting device-and a stop allowing on one hand very accurate rotations by predetermined angles for every current impulse passing through the electromagnets and keeping on the other hand the angle of rotation of the transmission pulleyA underneath a limit value.

Other features of my invention will appear from the following description of aV transmission given by way of example and illustrated on accompanying drawings on which:

Fig. 1 is a diagram of the whole arrangement serving as an auxiliary motor.

Fig. 2 is partly a front view of the same continuously by the electric motor 5 (omitted from Figs. 2 to 4'). An intermediary pinion 4c is used forreversingthe relative motion of 4b with reference to 4a. The two ends of Y the shaft 2 areprovided with two friction wheels 6a, 6b adapted to move longitudinally along shaft 2 without rotating with reference thereto. Forks 7a, 7b control the friction wheels and move them towards or away 5 is a diagram of the contacting from the Vcorresponding toothed wheels.

These forks are pivotally securedto spindles 8d, 8b (Fig. 2) and are connected at 9a, 9b with the plunging cores 11a, 11b of the electromagnets 12a,12.` Springs 13a,13b return the cores outwards, whereas the excita` tion ofthe electromagnets draws them inwards. f

The worm 3 meshes with apinion 14 keyed to the intermediary shaft 15 which through a worm 16 controls apinion 17 keyed to the transmission shaft 18 (Figs. 1 and 4). To the transmission shaft is keyed atoothed wheel 19 disposed in front of a toothed wheel 21 having the same diameter and the same tooth-work and secured to or integral with the transmission pulley 22 over which passes a'belt actuating the devices to be controlled bythe auxiliary motor described. A comparatively widevpinion 23 isimountedon a pivoting part `24 (Figs. 2 to 4) adapted to swing on the spindleA 25a under the 'action of the' spindle 256 when it is desired to make the pinion 23 mesh simultaneously with the two toothed'wheels 19 and 21.

The device works as follows. Y

I will suppose the electromagnet 12b is excited and attracts itsfcore 11b. This will due to the connection between the core and the taken to move the pivoting part 24 so as to bring the pinion 23 into mesh with the wheels 19, 21, these latter will rotate together and drivethe pulley 22. Obviously if the electromagnet 120; has been'excited, the pulley would have rotated in the reverse direction.

Current is sent into the electromagnets' 12a,

.12b through a three-contact switch 5).

Of these three contacts 26a, 266, 260 the middle contact 260 is neutral. Obviously'according as to whether the switch arm 27 is on one or the other of these contacts, the pulley will be rotated in one or the other direction or else is stationary. v

To make the pulley rotate by y predetermined angles, I may use the contact device diagrammatically yshown on Fig. 5. To' the pulleyr22 or to a cylinder rotating therewith are applied two contact plates 28a, 28?) separated by insulation at 29., Over these plates are adapted to rub sets of brushes 31a-31?), 32a,32 which when thetransmission is inoperative are symmetrically disposed with reference to the insulation 29. Each brush receives current through a switch 33a, 34a., 33?), 34?) from a common supply of current 35. Y Y

The working is as follows. I will suppose for instance that the arm 27 feeds the electromagnet 12a which makes the pulley rotate in the direction of the arrow and that the switch 34a is closed. The current passes thus from 35 through the arm 27, the electromagnet 12a, the contact 28a, the brush 32al and the switch 34a. The pulley will rotate in the direction.

of the arrowbut when it has rotated by an angle equal to that separating the insulation 29 from the brush 32a, the said insulation will come under the latter whereby the current is broken and consequently the pulley ceases rotating after having passed through a predetermined angle.

l vmay also in this case do away with the three-contact switch, the windings 12al and 12b being connected together and with the supply 35. According as to which switch 33a,A

This stop is Yconstituted by a conductingV plate 36' secured to the periphery of the pulley or of a cylinder rotating therewith. A brush 37 adapted to rub on thisplate is eleC trically connected with the supply 38. On either side of the brush 37 and symmetrically with reference thereto for the inoperative posit-ion of the arrangement, are two insulating parts 39a, 39?) adapted yto come under the brush 37 when the pulley'rotates.

The arm 27 still feeding the electromagnet 12a, the circuit will be closed through the plate 3e and' the brush 37 and will cause the pulley to rotate in the directionv ofthe arrow.

But when the pulley has rotated by an angle corresponding to lthe angular distance between 37 and 39a, the insulating part 39a coming under the brush 37 will break the circuit and the pulley'will stop.

What I. claim is: Y

1f. A transmission chiefly for controlling Vaeroplane rudders comprising a driving shaft, twjo ltoothed wheels means whereby the driving shaftdrives said wheels at the same speed, a driven shaft on which said wheels are loosely mounted, `two friction wheels splined to said driven shaft, on either side of the toothed. wheels, means forv controlling the. longitudinal motion of the friction wheels on their shafts, a worm on the driven shaft, a.

worm wheelmeshingwith said worm, a second worm gear controlled by saidr worm wheel, a pinion controlled by said worm gear, a power transmitting part, a gear wheel secured! to said part and the size and toothwork of which are ident-ical with the size and to'othwork of the pinion, a pivotally mounted second pinion adapted to simultaneous mesh with the first pinion and with the last mentioned gear wheel.

2. A device of the class described comprising a driving shaft, a pair of toothed wheels loosely journaled thereon, a pair of friction wheelsy slidably keyed on said' shaft, means for' driving the toothed wheels, means for selectively sliding the friction'wheels for engagement with. the toothed wheels to' cause the same to rotate with the shaft, a driven shaft, a gear fixed to said shaft, a power transmitting element` on the latter shaft and having a gear thereon, a pinion, means for swinging the pinion into or outV of mesh with both gears, and a driving connection between said shafts. v

RAOUL BERNADY.

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